docs(bankr): weekly skill update — x402 any-token, expiring LLM credits, Fable 5, club upgrade, bulk transfers

[sidrisov]

Summary

Weekly refresh of the bankr skill to keep its documented capabilities in sync with what the Bankr agent, CLI, and APIs now support. Documentation-only — no behavioral content beyond accurate capability descriptions.

Changes

x402 paid API calls (SKILL.md, references/x402-cloud.md)

• Payments are no longer USDC-only: callers can pay in USDC or any supported ERC-20 on Base, and you can price your own endpoints in any supported ERC-20.
• Revenue is settled on-chain and accounted in USD at settlement time.
• Documented the optional per-endpoint payment-token configuration and updated the "How Payment Works" flow accordingly.

LLM Gateway (SKILL.md, references/llm-gateway.md)

• Added claude-fable-5 to the available models list.
• Documented time-limited expiring credit grants — spendable balance = permanent pool + unexpired grants, with grants spent first (soonest-expiring first) and dropping off automatically at expiry.
• Removed the ended BNB Chain top-up promo (BNB Chain remains a supported top-up chain; only the bonus offer ended).

Bankr Club (SKILL.md)

• Documented monthly → yearly upgrades via the agent: the yearly term stacks on top of any remaining monthly time, so no paid time is lost.

Transfers (SKILL.md, references/transfers.md)

• Documented bulk / multi-recipient sends: same-chain ERC-20 transfers to many recipients batch into a single on-chain transaction, with per-recipient outcomes reported. Added prompt examples.

Notes

• Public-repo safe: general capability documentation only.

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